Armature for dynamo-electric machines.



Y No. 628,050. Patented July 4; |899.

H. H. WAIT.

ABMATURE FOR DYNAMU ELECTRIC MACHINES.

(Application filed June 10, IBDBJ (No Model.)

UNITED 'STATES PATENT FEICE.

HENRY H. WAIT, OE CHICAGO, ILLINOIS, AssIeNoR To THE WESTERN ELECTRICCOMPANY, OE SAME PLACE.

`RVIATURE FOR DYNAIVlO-ELETRIC MACHINES.

srECIFICATIoN forming part of Letter-s Patent No, 628,050, dated July 4,1899. Application filed June 10,1898. Serial No. 683,065.. (No model.)

Tol (all whom, it 'nm/fj con/cern:

Be it known that I, HENRY IIVAIT, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvement in Armatures for Dynamos,(Case No. 11,) of which the following is a full, clear, concise, andexact description.-

My invention relates to dynamo-electric machines of that class employingiron-clad armatures, and has for its object the improvement in theconstruction of said armatures to obviate certain defects heretoforeexisting and to simplify the construction of the armature.

The invention, generally speaking, may be said to consist in an armaturehaving a core of magnetic material provided with a plurality ofcoil-receiving grooves, each groove being provided at its longitudinalopening with a plurality of longitudinally-separated lugs integral withsaid core, a retaining-strip of non-magnetic material being preferablyin terposed between said lugs andthe arm ature'- wire within thegrooves. By this construction I am enabled to reduce the self-inductiveeffect in the arm attire-coils, thereby reducing the sparking at thecomm utator-brushes upon change of load, while at the same timebandwires for retaining the armature-coils in position against theaction of centrifugal force may be dispensed with.

I will explain my invention more particularly by reference to theaccompanying drawings, which illustrate the preferred embodimentthereof.

In the drawings, Figure l is a longitudinal sectional view of anarmature core constructed in accordance with my invention. Fig. 2 is apartial elevation thereof, portions being broken away to reveal moreclearly the construction of the armature. Fig. 3 is a plan view of aportion of the armature shown in Fig. l. Fig. 4 is a cross-sectionalview of a portion of the armature on line 4 4 of Fig. l. Fig. 'is across-sectional View of a portion of the armature on line 5 5 of Fig. l.

Like letters indicate like parts throughout the diiferent views.

The armature-core Ct is preferably of iron and composed of a number oflaminze assemerably of the crosssection shown in Figs. 2, 1

4, and 5. In Figs. 4 and 5 a diaphragm of insulating material e is shownbetween different parts of an armature winding. Each coil-receivinggroove is also preferably provided 'with a liningf of insulatingmaterial. The core plates or laminze are preferably stamped in thedesired shape, some of the plates in each core being provided withinwardly-prog ectin g lugs dd', which serve partially to close thecoil-receiving grooves, sufiicieut space being left between the opposinglugs forV the passage of the armature-wire. The lugs are longitudinallyseparated, so that increased air-gaps are provided at intervals alongthe grooves between the separated lugs to increase the magneticreluctance to throttle the lines of force which are set up in the metalsurrounding the grooves and to reduce objectionable reactions betweenthe armature and the fields.

After the armature-wire hasbeen placed within the groovesretaining-strips g of nonmagnetic material, as wood, are driven in alongitudinal direction between the lugs and the armature-wire.Sufiicient lugs CZ are to be provided along the longitudinal openings ofthe coil-receiving grooves to prevent the retaining-strips and thearmature-wires from bulging outwardly. By stamping a number of plates ineach core with lugs and properly distributing such laminae throughoutthe body of the core the retaining-lugs may be made integral with thecore at minimum cost. I preferably provide each wall of each groove withthe retaining-lugs, the lugs being preferably placed opposite eachother, as shown.

IOO

1.' The combination in a dynamo-armature,

. c-f thin disks forming the core thereof having similar peripheralrecesses forming coil-channels in the armature, a large proportion ofsaid disks having a diameter substantially equal to the outer diameterof the coils, and the remainder being of greater diameter and havinginwardly-projecting lips formed in the said recesses at the peripheriesof these disks; whereby the coils are retained in place but theselfinduction of the coils is not substantially increased, substantiallyas described.

2. In a laminated armatureLthe combination of the disks forming the corethereof having teeth projecting from the peripheries thereof formingcoil-channels, a large proportion of said teeth having alengthsubstantially equal to the depth of the coil and the remaining teethbeing of the same form but of greater length and having projectionsformed at their extremities contracting the opening to the coil-channelwhereby the coils are retained in place by said longer teeth, While theself-induction of the coils is not substantially increased,substantially as described.

3. In an iron-clad armature for dynamoelectric machines, the combinationof disks having projecting teeth of substantially the same length as thespace occupied by the coil, With disks having similar teeth projectingfarther than the others adapted to hold blocks or Wedges, whereby thecoils are retained in place, substantially as described. y

In Witness whereof Ihereunto subscribe my name this 19th day of May, A.D. 1898.

HENRY H. WAIT.

Witnesses:

GEORGE L. CRAGG, A. LYNN LAWRENCE.

